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sbrk undefined symbol


Stephane Dalton writes:
 > I've a simple question for you, I've successfully build a m68k-psos-elf
 > compiler and library (binutils 2.9.1, gcc-2.95.2, and newlib 1.8.2), and
 > I've been able to compile assemble and link my new bootloader for our board.
 > 
 > Today I've added a #include <assert.h> inside on of the file and now at link
 > time I got these error messages:

Loosely phrased [the details aren't important]:
assert() calls fprintf, fprintf calls malloc, malloc calls sbrk.

 > ent/sbrkr.c:61: undefined reference to `sbrk'

 > I've encountered this kind of error before (for different type of function)
 > and the FAQ simply told to stub out these. Should I do the same here. I'm a
 > bit worry to see sbrk here because as far as I know it is used for memory
 > allocation???

sbrk is a function you have to write yourself.
See for example newlib-1.8.2/libgloss/mcore/sbrk.c.

An alternative is to roll your own assert() and avoid this.

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